Prepositions
IN = dentro, em, no, na After cities, states, countries and continents. Ex.: I live in Brazil. We stopped in/at Curitiba on the way to SP. To indicate de position DENTRO. Ex.: in the drawer. Period of the day. Ex.: In the morning. Months without days. Ex.: in September. Months with years. Ex.: in May, 1987.
Seasons. Ex.: In (the) Summer! Years. Ex.: In Centuries. Ex.: In the nineteenth century. In front of streets. Ex.: She is in Nereu Ramos street. (British English) Theyll arrive in a few minutes/hours/ week/moths. (time that will take) Im in the corner. (no canto) In front of the weekend. Ex.: I travel in the weekend. (British English) Outras combinações possíveis p. 111.
ON = sobre, em, no (a) To indicate de position EM CIMA. Ex.: The papers are on the desk. In certain places/words: on the island, farm, beach, the screen, TV, the train, ship, plane, ground, second floor, bus, the telephone, the radio. In front of streets. Ex.: I live on João Dreschler street. (American English) In front of the weekend. Ex.: I work on the weekend. (American English)
Days of the week. Ex.: on Saturday. Months + Day. Ex.: My birthday is on May 7th. Months + Day + Year. Ex.: on January 10th Special Days. Ex.: on Easter Sunday. Period of days with adjectives. Ex.: on a cloudy night. Outras combinações possíveis p. 112.
AT = junto a, em, no, na, à To certain places. Ex.: at the airport, the door, the chalkboard, Marys house, home. Im at/on the corner. (na esquina) Address with number. Ex.: He works at 450 Main street. To schedules. Ex.: at 3 pm. Meals. Ex.: At dinner. With feasts. Ex.: At Christmas.
In the expressions: at night, present, the moment, the same time. Ability, price and age. Ex.: Im good at Portuguese. She bought this car at a good price. At the age of 16 she just thought about her car. Outras combinações possíveis p. 112.
Some Situations He is at the club. (jogando) He is in the club. (dentro do prédio) She is at the theater. (Assistindo a uma peça) She is in the theater. (dentro do prédio) I woke up in the night. (durante a noite) I cant sleep at night. (à noite) I arrived in time to see the show. (em tempo) The bus left on time. (na hora certa)
With go, come, get and arrive we dont use any preposition. Ex.: Im going home. INTO = para dentro de Ex.: The thief is going into the jail.